Re: [v2] RANDOM: ATH9K RNG delivers zero bits of entropy

From: Kalle Valo
Date: Tue Sep 27 2016 - 10:44:33 EST


Stephan Mueller <smueller@xxxxxxxxxx> wrote:
> The ATH9K driver implements an RNG which is completely bypassing the
> standard Linux HW generator logic.
>
> The RNG may or may not deliver entropy. Considering the conservative
> approach in treating entropy with respect to non-auditable sources, this
> patch changes the delivered entropy value to zero. The RNG still feeds
> data into the input_pool but it is assumed to have no entropy.
>
> When the ATH9K RNG changes to use the HW RNG framework, it may re-enable
> the entropy estimation considering that a user can change that value at
> boot and runtime.
>
> Reviewed-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Signed-off-by: Stephan Mueller <smueller@xxxxxxxxxx>

Based on the discussion I'm dropping this patch. But the discussion was
hard to follow so please let me know if I misunderstood.

Patch set to Rejected.

--
https://patchwork.kernel.org/patch/9266265/

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